| Term | Definition |
|---|
| Coniferous | a tree that bears cones and evergreen needlelike or scalelike leaves. Conifers are of major importance as the source of softwood, and also supply resins and turpentine. |
| Savannas | a grassy plain in tropical and subtropical regions, with few trees |
| Steppe | a large area of flat unforested grassland in southeastern Europe or Siberia |
| tornado | destructive vortex of violently rotating winds having the appearance of a funnel-shaped cloud and advancing beneath a large storm system |
| blizzard | a severe snowstrom with high winds and low visibility |
| drought | a prolonged period of abnormally low rainfall; a shortage of water resulting from this |
| ecosystem | is an interdependent community of plants and animals. |
| biome | are further divided into forest, grassland, desert, and tundra. |
| deciduous | are broadleaf trees, such as maple, oak, birch, and cottonwood. |
| rain forest | is located in the tropical zone and is covered with a heavy concentration of broadleaf trees. |
| Solstice | When the sunrays shine directly overhead. |
| Equinox | Twice a year the days and nights all over the world are equal in length. |
| Weather | The condition of the atmoshpere at a particular location and time. |
| Climate | The term for weather conditions at a certain location. |
| Convection | When winds and ocean currents distribute the suns heat from one part of the world to another |
| El Niño | A natural change in the climate, when the winds over the pacific changes direction or slows changing the temperature and affecting the weather world wide |
| Greenhouse Effect | When natural and man-made gases get trapped in the earths atmosphere |
| Tundra | The flat treeless area forming a ring around the arctic ocean |
| Permafrost | When the subsoil has a permanently frozen |
| Precipitaion | rain, snow, sleet, or hail that falls to the ground |
| rain shadow | a region having little rainfall because it is sheltered from prevailing rain-bearing winds by a range of hills |
| hurricanes | a storm with a violent wind, in a particular a tropical cyclone in the Caribbean |
| typhoons | a tropical storm in the region of the Indian or western Pacific Oceans. |
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